20080868 Ver 2_I-16 2015 Tooley Sweep Downstream Biotic Index Table_20160708

Table 1-16. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Tooley Creek downstream station in
May of 2015.
Species/taxon'
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value (n)
Product of
(SV)(n)
Annelida
Oligochaeta
Enchytraeidae sp.
2
1.0
1
1.0
Tubificidae sp. wio hair
2
1.0
1
1.0
Tubificoides heterochaetus
4
1.0
3
3.0
Polychaeta
Amphicteis floridus
44
2.0
30
60.0
Marenzelleria viridis
6
2.6
3
7.8
Polydora cornuta
26
1.2
10
12.0
Arthropoda
Insecta
Diptera
Chironomus decorus
218
1.0
100
100.0
Dicrotendipes nervosus
33
1.0
30
30.0
Goeldichironomus devineyae
84
2.0
30
60.0
Parachironomus sp.
5
1.1
3
3.3
Tanytarsus sp.
181
2.3
100
230.0
Odonata
Enallagma sp.
12
1.5
10
15.0
Malacostraca
Amphipoda
Apocorophium lacustre
111
2.2
100
220.0
Apocorophium louisianum
65
2.2
30
66.0
Apocorophium sp.
300
2.2
100
220.0
Gammarus mucronatus
248
2.3
100
230.0
Gammarus tigrinus
300
2.0
100
200.0
Decapoda
Palaemonetes pugio
72
2.5
30
75.0
Rhithropanopeus harrisii
6
2.5
3
7.5
Isopoda
Cassidinidea lunifrons
18
2.0
10
20.0
Cyathura polita
17
2.0
10
20.0
Edotia montosa
6
2.6
3
7.8
Mysida
Americamysis almyra
36
2.2
30
66.0
Tanaidacea
Hargeria rapax
275
1.6
100
160.0
Maxillopoda
Sessila
Balanus improvisus
6
2.0
3
6.0
Mollusca
Bivalvia
Macoma tenta
2
2.0
1
2.0
Mytilopsis leucophaeata
9
1.5
3
4.5
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
1044
2,027.9
Estuarine Biotic Index = 1.94
Total taxa = 31
Total taxa with sensitivity values = 26
'Only those taxa for which a sensitivity value is available are displayed
bTotal number of individuals caught in all three sweep replicates.
Sensitivity values provided by NCDWR.
1-22